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504/p=21
We move all terms to the left:
504/p-(21)=0
Domain of the equation: p!=0We multiply all the terms by the denominator
p∈R
-21*p+504=0
We add all the numbers together, and all the variables
-21p+504=0
We move all terms containing p to the left, all other terms to the right
-21p=-504
p=-504/-21
p=+24
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